Crack detector for electrically conductive windshield

Details Crack detector for electrically conductive windshield Crack detector for electrically conductive windshield

1984-06-14

1986-01-21

Albritton, C. L.

Electric heating

Heating devices

With current connection and/or disconnection means

219203, 219522, H05B 102, B60L 102

Patent

active

045659192

ABSTRACT:
A circuit and method for interrupting power applied to an electrically conductive panel such as a vehicle windshield or window upon cracking of the conductive coating or element thereon. The circuit includes structure for (1) monitoring the resistance of the conductive element and (2) interrupting power applied thereto when the resistance of the conductive element assumes a value indicative of element cracking.

REFERENCES:
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patent: 3760157 (1973-09-01), Newman et al.
patent: 3790745 (1974-02-01), Levin
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patent: 3892947 (1975-07-01), Strengholt
patent: 3905015 (1975-09-01), Inose et al.
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patent: 4109196 (1978-08-01), Carmody
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patent: 4260876 (1981-04-01), Hochheiser
Brochure entitled "Stratobel Alarm a.c.c.", by Glaverbel of Brussels, Belgium, 1982.

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